221000000020 has 48 divisors (see below), whose sum is σ = 481744666368. Its totient is φ = 85100780160.

The previous prime is 220999999999. The next prime is 221000000063. The reversal of 221000000020 is 20000000122.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1869762 + ... + 1984441.

It is an arithmetic number, because the mean of its divisors is an integer number (10036347216).

Almost surely, 2^221000000020 is an apocalyptic number.

221000000020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221000000020 is an abundant number, since it is smaller than the sum of its proper divisors (260744666348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221000000020 is a wasteful number, since it uses less digits than its factorization.

221000000020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3854320 (or 3854318 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

Adding to 221000000020 its reverse (20000000122), we get a palindrome (241000000142).

The spelling of 221000000020 in words is "two hundred twenty-one billion, twenty", and thus it is an aban number.